ruby/ruby.h: optimize rb_integer_type_p

* include/ruby/ruby.h (rb_integer_type_p): turn into macro to help
  clang based on old gcc to eliminate CSE.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Oct 27 23:28:12 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby/ruby.h (rb_integer_type_p): turn into macro to help
+	  clang based on old gcc to eliminate CSE.
+
 Thu Oct 27 16:33:47 2016  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* tool/redmine-backporter.rb (rel): check the exception and show right

include/ruby/ruby.h

@@ -1480,6 +1480,17 @@ rb_obj_write(VALUE a, VALUE *slot, VALUE b, RB_UNUSED_VAR(const char *filename),
 
 #define RUBY_INTEGER_UNIFICATION 1
 #define RB_INTEGER_TYPE_P(obj) rb_integer_type_p(obj)
+#if defined __GNUC__ && !GCC_VERSION_SINCE(4, 3, 0)
+/* clang 3.x (4.2 compatible) can't eliminate CSE of RB_BUILTIN_TYPE
+ * in inline function and caller function */
+#define rb_integer_type_p(obj) \
+    __extension__ ({ \
+	const VALUE integer_type_obj = (obj); \
+	(RB_FIXNUM_P(integer_type_obj) || \
+	 (!RB_SPECIAL_CONST_P(integer_type_obj) && \
+	  RB_BUILTIN_TYPE(integer_type_obj) == RUBY_T_BIGNUM)); \
+    })
+#else
 static inline int
 rb_integer_type_p(VALUE obj)
 {
@@ -1487,6 +1498,7 @@ rb_integer_type_p(VALUE obj)
 	    (!RB_SPECIAL_CONST_P(obj) &&
 	     RB_BUILTIN_TYPE(obj) == RUBY_T_BIGNUM));
 }
+#endif
 
 #if SIZEOF_INT < SIZEOF_LONG
 # define RB_INT2NUM(v) RB_INT2FIX((int)(v))